Background knowledge and the construction of a situational representation from a diagram

Comprehension of a diagram requires viewers to construct from its graphic constituents a mental representation that captures the situational entities and relationships referred to by the diagram. However, this implies viewers possess appropriate background knowledge concerning the depicted situation. Meteorologists' and non-meteorologists' mental representations were investigated using a three-stage card sorting task during which subjects generated hierarchical groupings of the graphic elements of an Australian weather map diagram. Cluster analysis indicated that the two subject groups differed fundamentally in the basis of their sorting behaviour. Subjects' justifications of the groupings suggested that non-meteorologists' mental representation of the diagram elements was primarily based upon domain-general, visuospatial characteristics whereas in meteorologists' representations, these characteristics were subservient to a domain-specific, situational interpretation of the graphic array. The findings indicate that background knowledge deficiencies may make it difficult for learners beginning study of a domain to construct suitable mental representations from domain-related diagrams.     

“Reading” scientific diagrams: Characterising components of skilled performance

Conclusion The interpretation of scientific diagrams has been characterised as a complex process. This contrasts sharply with an apparently widespread view among producers and users of resources for science teaching that they are generally unproblematic and that their meaning is usually quite transparent. The continued currency of this view is a matter of concern, especially when resources for learning in science are now so heavily based on pictorial presentation. It is likely that students who are new to scientific diagrams as a pictorial genre will look at them in a manner that is quite different from the way they are seen by their teachers. What seems to a teacher to be a straightforward and clearly presented depiction of a scientific concept, process or structure may be a mysterious and impenetrable abstraction to a student. Whereas the teacher is able to identify readily the elements of a diagram and link them into a coherent, meaningful whole, the student may misunderstand what it is that is depicted and how the depicted entitles are related. A critical factor underlying such differences appears to be the extent and nature of the mental representation of student and teacher. Both of these aspects of the mental representation of scientific diagrams would probably have to be addressed if there are to be improvements in the development of students' diagram interpretation skills. It does not seem sufficient merely to give students a huge diet of diagrams and assume that the necessary reading skills are either present or will develop by themselves. Rather, a deliberate programme designed to develop well structured mental representations of scientific diagrams should accompany efforts to build up an extensive knowledge base about this highly specialised form of visual display. Such a programme should be accompanied by instruction that develops appropriate processing strategies that allow students to gain maximum value from the diagrams they encounter.     

职业教育校本课程开发对教师专业化发展的意义与要求

校本课程开发本身赋予教师一定的职能,并对教师的专业化发展提出了素质要求。教师要真正成为职业教育校本课程开发的主体,就应该注重自身的专业化发展,利用自身深厚的专业知识与技能和高尚的职业道德品质与人文素质,积极推进课程的校本化。     

Low-Income Children's After-School Care: Are There Beneficial Effects of After-School Programs?

4 types of after-school care (formal after-school programs, mother care, informal adult supervision, and self-care) were examined for 216 low-income children ( M age = 9.1 years). After-school care was associated with maternal education, race, and family income but not with child gender, family marital status', neighborhood safety, or parenting style. When maternal education, race, and family income were controlled, attending a formal after-school program was associated with better academic achievement and social adjustment in comparison to other types of after-school care. Children's activities and experiences also varied in different after-school settings. Children in formal programs spent more time in academic activities and enrichment lessons and less time watching TV and playing outside unsupervised than other children. They also spent more time doing activities with peers and adults and less time with siblings than did other children. The time that children spent in these activities was correlated with their academic and conduct grades, peer relations, and emotional adjustment.     

Using Microcomputers in the Classroom

Drawing upon their practical experience as teachers and as teacher trainers, the authors describe development work done in a school for children with severe learning handicap. The project in question focused upon the communication and learning needs of a boy with athetoid cerebral palsy. Over a period of time, both the computer hardware (mainly communication devices) and software programmes were developed which have made an incalculable contribution to the boy's contact with his teachers and his fellow‐pupils. The work done has already been adapted and made available for other pupils.     

Search Strategies and Inference in the Exploration of Scientific Diagrams

The salience assigned to information in a diagrammatic display may vary according to the goals and background of the viewer. As well as being a function of the characteristics of the diagrammatic material presented, the way in which an individual extracts and acts upon information from such displays will be a function of the characteristics of the individual's particular mental representation of that display type. The strategies used by professional meteorologists to explore a meteorological chart were compared with those used by non‐meteorologists. Differences found between the groups involved both the patterns of exploration used and the way inference was used as a basis for decision‐making. These differences were interpreted as reflecting differences in underlying mental representation. The findings raise a number of questions concerning ways in which diagrammatic material is treated during instruction in subjects such as science.     

Effects of Early and Recent Maternal Employment on Children from Low-Income Families

The effects of early maternal employment (employment during the child's first 3 years) and recent maternal employment (employment during the previous 3 years) on 189 second-grade children from low-income families were examined. Maternal employment was related to a number of selection factors. In comparison to mothers who were not employed, employed mothers scored higher on a mental aptitude test and were more highly educated. Both early and recent maternal employment were also associated with measures of the current family functioning: there was less poverty and higher HOME environment scores when mothers were employed. Hierarchical multiple regressions showed that children's math achievement was positively predicted by early maternal employment and children's reading achievement was positively predicted by recent maternal employment, even after controlling for selection effects and current family environment. These results are discussed in terms of possible mechanisms by which maternal employment may affect children's development.     

Diagram prediction and higher order structures in mental representation

Predictions of the patterns likely to appear on a weather map diagram one day later than those shown on a given map were drawn by meteorologists and non-meteorologists. Differences in secondary structures of the predicted patterns with respect to the spacing and alignment of graphic elements were consistent with the existence of fundamental differences in mental representation between the subject groups. Lack of expertise in the subject domain of the diagram was associated with the production of patterns containing meteorologically-arbitrary arrangements of graphic elements. It is suggested that science instruction should include explicit consideration of the higher order structures present in diagrams. Specializations: mental representation and processing of scientific diagrams, characteristics of explanatory illustrations, drawing and cognition, instructional design.